set static dns for network connection using windows console cmd script

set-dns.cmd

@echo off

set /a whichdns=(%RANDOM%*2/32768)+1
if %whichdns% equ 1 (
	set DNS1=137.22.198.40 && set DNS2=137.22.198.41
) else (
	set DNS1=137.22.198.41 && set DNS2=137.22.198.40
)

route -4 print | findstr "137.22.195.254" && set DNS1=137.22.194.250
route -4 print | findstr "137.22.94.254" && set DNS1=137.22.94.250

REM i = Enabled, j = Connected, k = Type, l = Interface Name
for /f "skip=2 tokens=1,2,3*" %%i in ('netsh int show interface') do (
	if %%i equ Enabled if %%j equ Connected  (
		LOCALDNS=0
		netsh int ipv4 show dns "%%l" | findstr "127.0.0.1" && set LOCALDNS=1
		netsh int ipv4 show dns "%%l" | findstr "137.22.1.13 137.22.1.14 137.22.128.2"
		if %ERRORLEVEL% equ 0 (
			netsh int ipv4 set dns name="%%l" static %DNS1% primary validate=no
			netsh int ipv4 add dns name="%%l" %DNS2% index=2 validate=no
			if %LOCALDNS% equ 1 (
				netsh int ipv4 add dns name="%%l" 127.0.0.1 index=3 validate=no
			) else (
				netsh int ipv4 add dns name="%%l" 8.8.8.8 index=3 validate=no
			)
		)
	)
)

goto exit

:exit